Diaphragm pump



Aug. 7, 1928.

1,680,089 W. B. CROFTON DIAPHRAGM PUMP Filed Jan. 1 5, 1927 WILFRED BRERETQM CRQFTON N\VENTQF By I ' www,

Patented Aug. 7, 1928.

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- phragm pumps an object of the invention l nrnrrrnnslvr PUMP.

Application sied l:imam V15, 192'?, semi 1ro. 151,322, and-n Union of south Africa november s,- ieee.

i 4The present `invention relates to" diabeing to `prot/ide a pump of this class suitable for a bore hole. pump.A

.A bore hole pump constructed according to the invention is illustrated in thev accom# panying drawingsin which Fig. I is an elevation, partly sectioned on I-I Fig. III...` 'F

Fig. II is a continuation of the upper part` of Fig. I, drawn toa reduced scale.

Fig. III Y is a cross section on III-III Fig. I.

K Fig. pump detached.'

IV showsfthe inner assemblyof the .2 indicates a cylindrical casing in which is mounted the diaphragm member 3. Said member consists of` a .triangular rubber tube flattenedattheV corners, which aresecured to the inside of the casing 2 by bolting strips Ltand bolts 5. The corners are reinforced by s uch means as inserted fabric 6 to protect them against the'pressure and Vflexing which takes place there. i The segmental cavities 7 between the casing 2 and the sides of the triangular tube are the pump chambers; the normally fiat faces of the tube constituting the diaphragms 8 which are periodically iexed to vary the VvolumeV of the pump chambers. Y

The inner assembly of the pump-shown separately in Fig. I'V-fcomprises a triangu lar frame 9 which fits within the tube 3. Saidframe carriesfthecrank shaft 10, rotatablymounted in-fbearingsl/l which may beef hard wood fixed in 'caps 12 removably screwed into partition plates 13, 14 forming part ofthe frameg'fhediaphragms are comparatively narrow `in the direction of the movement of the `'rollers over them in order to.1 minimize their tendency to forman outwardly bulging waveahead of the roller, which lessensthe displacement of the pump and also tends to injure the rubber.

The end of the framebelow the partition 14 forms the common inlet chamber 15 for the several pump chambers; and thatabove' the partition 13 'similarly' forms the outlet f chamber 16. For each Ypump Vchamber there is an inlet valve 17 mounted on a plate l18 having a valve aperture 19 corresponding to4 the valve aperture 2O in the frame 9. Y The plate 18 clamps the rubber Yof the tube 3 betweenitself and the frame 9 to make a water tight joint around the apertures` 19, 20; plugs 21 beingprovided where necessary inV the casing to give access tothe bolts or screws 22. Anoutlet valve each pump chamber 7, on the inside of the frame, a clamping plate 24 being secured on the outside thereof. The several clamping o plates 18, 24 are positioned and secured after the frame 9 has been inserted into the tube 3. At the ends of the casing are screw caps 25 fitted with packing 26 for closing the ends of the pump `chambers 7. The tube-3 is formed at each end with an inward flange 27 which comes between the end of the frame 9 and the packing 26 to prevent leakage between the frame 9 and the tube 3; said flanges 27l being flexible to permit the frame to be inserted into the tube.`

Onthe crank 10 are mountedirollers which consist of wooden discs `28 halved for assembly on the crank, and rims 29 which hold the halves together in position and are of suficient diameter to be threaded onto the crank from the end. The rollers are spaced apart bybars 30 forming part of the frame 9 and welded or otherwise secured to the frame corners after the rollers are in, position. i

The bars 30 also constitute a series of spaced supports for the outer face of the diaphragm which also help to prevent the formationl of the aforesaid wave in the rubber. When heavy pressures are to be dealt AThese ribs extend longitudinally and form with the bars 30 a supporting system for the diaphragmequivalent to a system of beams and rafters. They open out fanwise when the diaphragm is flexed, as shown at the right hand sidefof Fig. III, but close` to gether laterally land form a rigid block as indicated at the left han-d side of the same figure, when the. diaphragm flattens again.

The lowerend -of the crank shaft extends through the opening 32 in the lower capi25.. through which the water enters the pump.'

It is forked and fits over a bar 33 or other fixture in the bore hole casing 34; or is otherwise held against rotation.

The delivery pipe 35 is screwed into an axial socket in the upper cap and secured by a clamp'36. Said pipe extends to the surface and connects with a fixed delivery pipe 37, (Fig. II) by means of a stuffing 23 is also provided for .osa y llt) box 38; Any'suitable means for rotating the pipe35 and thereby driving the pump, is employed; such as the split pulley 39 clamped tothe pipe land connected by a belt to an appropriate motor.

There is also shown a hand actuating arrangement comprising a portion ot' the pipe bent to form a pair of hand cranks 40. The' vertical rotational drive moreover renders theapparatus suitable to be driven by a horizontal Wind Wheel of Which various forms are known and which may be connected directly to the pipe.

' vIn the operation `of the device the rotation of' the pump casing structure .brings the crank rollers 29 successively into engagement with each diaphragm 8 as indicatedv at the right hand sideof Figs. I and III; liquid is thereby forced out oi' the pump chamber 'i' With Which Such diaphragm is associated, pastV its outlet valve 23 into the chamber 16, and so up the pipe 35' to the surface. Mean- 4 While liquid flows into the other pump cham-- bers Z (shown at theleft in F ig. III) past their inlet valves 17 and iills said chambers ready for discharge When they, in turn, arrive at the crank. Y l It will be noted that the direction of roi tation is immaterial and that oscillating ro VVform of Windmill mechanism usually ein.

tation of suitable amplitude'is equally as ellfective as continuous rotary motion. The oscillating motion may be` derived from the ployed to drive a bucket pump; and in the case of hand actuation it may be applied byv a leverclamped to the pipe. The capacity of a pump of a given diameter may be variedasdesired by varying its length,

y parts inthe Without altering the throw of thecrank` and the consequent flexing of the diaphragm. There need be no metal tof metal Wearing pump.

I claim `1.,Iii a pump, the combination of a rotatable. casing structure providing a Vpump chamber, a flexible diaphragm forming Wall of said chamberga lixed crank positioned toV flex the diaphragniupon rotation ofthe casing structure, inlet and outletvalves for the pump chamber, and means to i rotate.v the casing structure.Y

v2. In a pump, the combination of a ro- 'i table casing` structure providing a pump chamber, ay flexible diaphragm forming a Wallof Said chamber, a fixed crank `)ourn'alled Vin the casing structure and positioned to flex` the diaphragm upon `rotation of the casing structure, inlet and outlet valves for the pump chamber, a delivery chamber 1n the casing structure. and-1 a delivery pipefcon- "nected to said delivery chamberand constion of the casing.

the casing structure rotates, an inlet valve and an outletvalve Vfor each Ypump chamber, a common delivery chamber for all the pump chambers, andadelivery pipe connected to said delivery chamber and constituting a .shaitrfor rotation of the casing structure.

ll. In a pump, the combination of a casi ing structure' providing a pump chamber, a Aflexiblediaphragm iorniinga Wall` of said soV chamber, a vcrank rotatable relatively to the*l 1 casingstructure and adapted to flex the dia phragin, and vspaced means 'at ythe crankr Ward face of the diaphragm to support the same against bulgiig.

5. vIn a pump,ithe' combinationof a. casing Y structure providing a pump chamber, a lex-l ible diaphragm forming a Wall ofsaid' chainber, a crank rotatable relatively to the casing structure, rollers onthe crankv adapted to roll ou the diaphragm and spzmedmembers ,supporting the `face of: the Vdiaphragm and separating the rollers from one another. 6. In a pump, the combination of a casing structure comprising an outercasing and a removable inner frame, flexible Vdiaphragme supported by the outercasing and the inner frame, andY forming" With the outercasing a plurality of pump chambers, and. a crank journalled in theinrier frameantico-operating With tlieldiaphra'gms tofl'ex the same.

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7. In a pump,A the combination ofa cylin-A Y drical outer casing, a polygonal iexible tube the normallyflat sid-esof Vwhich for-1n with thecasing segmentalpump chambers, a similarly polygonal frame Within .fand 'supporting t-he'tube, and a ,cranlr journalled in the frame and adapted tof flex the sides of tube. i Y' In testimony Awhereof I aiiix my signature.

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